formula to autofill with condition and skip blank cells

I have the master sheet and data sheet (more than 1 but same format)

This is the example of the data from the sheet

what I need to do is to copy the project and skip the second column

if the project is blank then copy all the second column

but if the next first column contains words again, then copy and skip the second column

also, skip the blank rows and the formula able to accommodate more than one data sheets

in my case, if the C Column cell is filled, then copy the cell, but if the C Column is blank, then copy the E Column until it blanks then go back to C Column

expected outcome:

the formula I use right now: =IF('Data1'!C7<>0;'Data1'!C7;'Data1'!E7)

the result from my formula:

Note: the data rows are not always the same number with every data sheet (i.e. data1 100 rows, data2 400 rows, so on and I need the formula to work continuously through all the sheet (i.e. after the data from data1 finished, the formula move to data2, so on)

thank you