/tmp/ccU04YRY.o: In function `main':
hotel-main.c:(.text+0xc5): undefined reference to `initialize'
hotel-main.c:(.text+0xf9): undefined reference to `spend_the_night'
hotel-main.c:(.text+0x12f): undefined reference to `Check_out'
hotel-main.c:(.text+0x13b): undefined reference to `the_availble_room'
hotel-main.c:(.text+0x14e): undefined reference to `Check_in'
hotel-main.c:(.text+0x18b): undefined reference to `print_name_list'
hotel-main.c:(.text+0x1a5): undefined reference to `income_today'
hotel-main.c:(.text+0x1ca): undefined reference to `spend_the_night'
collect2: error: ld returned 1 exit status