shar - create a shell archive 

$ sudo apt install sharutils

provides shar package

To create a shar archive file.

$ shar *.txt > mytext.shar

$ shar *.pdf > mypdf.shar

$ shar *.mp3 > mymp3.shar

$ shar *.c > myc.shar

remove all .txt , .pdf , .mp3 , .c files

and then,

To extract shar archive file

$ unshar mytext.shar

$ unshar mypdf.shar

$ unshar mymp3.shar

$ unshar myc.shar

regards,

T.Dhanasekar