Small change to utility.h (#500)
Small change to utility.h (#500)

Fix memory leak in C tree traversal helper
Gathros/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive