main.adb:17:04: warning: analyzing unreferenced function "Is_Unvisited_Land"
main.adb:35:07: warning: initialization of "Visited_Cell" has no effect[#0]
main.adb:44:20: warning: unused assignment[#1]
main.adb:45:20: warning: unused assignment[#2]
main.adb:46:20: warning: unused assignment[#3]
main.adb:48:23: warning: unused assignment[#4]
