/in/foo.c: In function 'main':
/in/foo.c:7:2: warning: implicit declaration of function 'prinf'; did you mean 'printf'? [-Wimplicit-function-declaration]
    7 |  prinf("%.2lf",c);
      |  ^~~~~
      |  printf
/usr/bin/ld: /tmp/ccFt0eWe.o: in function `main':
foo.c:(.text.startup+0x3a): undefined reference to `prinf'
collect2: error: ld returned 1 exit status