Missing Headers row and Leaving space - google-apps-script

Question

I was working with a combine sheets app script which is working fine at the spot by mereging A bunch of 36 sheetsinto one masterenter code here
the only flaw of the script is that it is not showing a common header row in the top and also leaving a space after data end from first sheets and so on >>>
here the code can anyone help a bit here
function combineSheets() {
var sApp = SpreadsheetApp.getActiveSpreadsheet();
var s1= sApp.getSheetByName("A1");
var s2= sApp.getSheetByName("A2");
var s3= sApp.getSheetByName("A3");
var s4= sApp.getSheetByName("A4");
var s5= sApp.getSheetByName("A5");
var s6= sApp.getSheetByName("A6");
var s7= sApp.getSheetByName("A7");
var s8= sApp.getSheetByName("A8");
var s9= sApp.getSheetByName("A9");
var s10= sApp.getSheetByName("A10");
var s11= sApp.getSheetByName("A11");
var s12= sApp.getSheetByName("A12");
var s13= sApp.getSheetByName("A13");
var s14= sApp.getSheetByName("A14");
var s15= sApp.getSheetByName("A15");
var s16= sApp.getSheetByName("A16");
var s17= sApp.getSheetByName("A17");
var s18= sApp.getSheetByName("A18");
var s19= sApp.getSheetByName("A19");
var s20= sApp.getSheetByName("A20");
var s21= sApp.getSheetByName("A21");
var s22= sApp.getSheetByName("A22");
var s23= sApp.getSheetByName("A23");
var s24= sApp.getSheetByName("A24");
var s25= sApp.getSheetByName("A25");
var s26= sApp.getSheetByName("A26");
var s27= sApp.getSheetByName("A27");
var s28= sApp.getSheetByName("A28");
var s29= sApp.getSheetByName("A29");
var s30= sApp.getSheetByName("A30");
var s31= sApp.getSheetByName("A31");
var s32= sApp.getSheetByName("A32");
var s33= sApp.getSheetByName("A33");
var s34= sApp.getSheetByName("A34");
var s35= sApp.getSheetByName("A35");
var s36= sApp.getSheetByName("A36");
var s37= sApp.getSheetByName("Master");
// If Master doesn't exist you'll need to create it here.
var s1values = s1.getRange(2,1,s1.getLastRow(),27).getValues();
var s2values = s2.getRange(2,1,s2.getLastRow(),27).getValues();
var s3values = s3.getRange(2,1,s3.getLastRow(),27).getValues();
var s4values = s4.getRange(2,1,s4.getLastRow(),27).getValues();
var s5values = s5.getRange(2,1,s5.getLastRow(),27).getValues();
var s6values = s6.getRange(2,1,s6.getLastRow(),27).getValues();
var s7values = s7.getRange(2,1,s7.getLastRow(),27).getValues();
var s8values = s8.getRange(2,1,s8.getLastRow(),27).getValues();
var s9values = s9.getRange(2,1,s9.getLastRow(),27).getValues();
var s10values = s10.getRange(2,1,s10.getLastRow(),27).getValues();
var s11values = s11.getRange(2,1,s11.getLastRow(),27).getValues();
var s12values = s12.getRange(2,1,s12.getLastRow(),27).getValues();
var s13values = s13.getRange(2,1,s13.getLastRow(),27).getValues();
var s14values = s14.getRange(2,1,s14.getLastRow(),27).getValues();
var s15values = s15.getRange(2,1,s15.getLastRow(),27).getValues();
var s16values = s16.getRange(2,1,s16.getLastRow(),27).getValues();
var s17values = s17.getRange(2,1,s17.getLastRow(),27).getValues();
var s18values = s18.getRange(2,1,s18.getLastRow(),27).getValues();
var s19values = s19.getRange(2,1,s19.getLastRow(),27).getValues();
var s20values = s20.getRange(2,1,s20.getLastRow(),27).getValues();
var s21values = s21.getRange(2,1,s21.getLastRow(),27).getValues();
var s22values = s22.getRange(2,1,s22.getLastRow(),27).getValues();
var s23values = s23.getRange(2,1,s23.getLastRow(),27).getValues();
var s24values = s24.getRange(2,1,s24.getLastRow(),27).getValues();
var s25values = s25.getRange(2,1,s25.getLastRow(),27).getValues();
var s26values = s26.getRange(2,1,s26.getLastRow(),27).getValues();
var s27values = s27.getRange(2,1,s27.getLastRow(),27).getValues();
var s28values = s28.getRange(2,1,s28.getLastRow(),27).getValues();
var s29values = s29.getRange(2,1,s29.getLastRow(),27).getValues();
var s30values = s30.getRange(2,1,s30.getLastRow(),27).getValues();
var s31values = s31.getRange(2,1,s31.getLastRow(),27).getValues();
var s32values = s32.getRange(2,1,s32.getLastRow(),27).getValues();
var s33values = s33.getRange(2,1,s33.getLastRow(),27).getValues();
var s34values = s34.getRange(2,1,s34.getLastRow(),27).getValues();
var s35values = s35.getRange(2,1,s35.getLastRow(),27).getValues();
var s36values = s36.getRange(2,1,s36.getLastRow(),27).getValues();
// Now, we can put out all together and stuff it in Master
var s37values = [];
s37values = s1values.concat(s2values,s3values,s4values,s5values,s6values,s7values,s8values,s9values,s10values,s11values,s12values,s13values,s14values,s15values,s16values,s17values,s18values,s19values,s20values,s21values,s22values,s23values,s24values,s25values,s26values,s27values,s28values,s29values,s30values,s31values,s32values,s33values,s34values,s35values,s36values);
s37.getRange(1,1,s37values.length,27).setValues(s37values);
}

Answer 1

Modification points:
About not showing a common header row in the top, in your script, all values are retrieved from the 2nd row. I thought that this might be the reason for your issue. From a common header row, in this modification, the header row is retrieved from the 1st sheet.
About also leaving a space after data end from first sheets and so on, I thought that the reason of your issue is due to getRange(2,1,s1.getLastRow(),27). In this case, the values are retrieved from 2nd row to the last row + 1 rows. In this case, it required to be getRange(2,1,s1.getLastRow() - 1,27).
In your script, I thought that the sheet names from "A1" to "A36" can be created using a script.
When these points are reflected in your script, it becomes as follows.
Modified script:
function combineSheets() {
var sApp = SpreadsheetApp.getActiveSpreadsheet();
var values = [...Array(36)].map((_, i) => `A${i + 1}`).flatMap((s, i) => {
var sheet = sApp.getSheetByName(s);
var lastRow = sheet.getLastRow();
if (i == 0) {
return sheet.getRange(1, 1, lastRow, 27).getValues();
}
return lastRow > 1 ? sheet.getRange(2, 1, lastRow - 1, 27).getValues() : [];
});
sApp.getSheetByName("Master").getRange(1, 1, values.length, 27).setValues(values);
}
The headr row is retrieved from the 1st sheet.
Note:
In this modification, it supposes that the sheet names of "A1" to "A36" and "Master" are existing in your Spreadsheet. Please be careful about this.
From a common header row in the top, this script supposes that your all sheets have the same header row. Please be careful about this.
About Exception: The number of rows in the range must be at least 1. AT HERE................var values = [...Array(36)].map((_, i) => A${i + 1}).flatMap((s, i) => { var sheet = sApp.getSheetByName(s); return sheet.getRange(i == 0 ? 1 : 2, 1, sheet.getLastRow() - (i == 0 ? 0 : 1), 27).getValues(); , from your question, I had thought that your all sheets have the values. But from your reply, it seems that my understanding was not correct. So, I updated my proposed script. Could you please confirm it?
References:
getRange(row, column, numRows, numColumns)
map()