[cc] D:\cours_eniso\2eme année\sem2\PFA\drivers\tm_stm32fdelay/ultrasonic.c:6: multiple definition of `main'
       [cc] ..\obj\main.o:D:\cours_eniso\2eme année\sem2\PFA\us015/main.c:24: first defined here
       [cc] collect2.exe: error: ld returned 1 exit status

BUILD FAILED
Total time: 3 seconds