C:\Users\Akshar Vaish\Documents\cpp\a.c\ak.c: In function 'main':
C:\Users\Akshar Vaish\Documents\cpp\a.c\ak.c:5:3: warning: implicit declaration of function 'returm' [-Wimplicit-function-declaration]
5 | returm(0);
| ^~
c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../../mingw32/bin/ld.exe: C:\Users\AKSHAR~1\AppData\Local\Temp\ccyOj4vi.o:ak.c:(.text+0x22): undefined reference to `returm'
collect2.exe: error: ld returned 1 exit status
You need to debug your code, it has some erros, for example, the complier is showing you that you wrote "returm" instead of 'return', maybe take a look and correct that.
C:\Users\Akshar Vaish\Documents\cpp\a.c\ak.c: In function 'main': C:\Users\Akshar Vaish\Documents\cpp\a.c\ak.c:5:3: warning: implicit declaration of function 'returm' [-Wimplicit-function-declaration] 5 | returm(0); | ^~ c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../../mingw32/bin/ld.exe: C:\Users\AKSHAR~1\AppData\Local\Temp\ccyOj4vi.o:ak.c:(.text+0x22): undefined reference to `returm' collect2.exe: error: ld returned 1 exit status