Changed type of command in struct to char** as per gitter discussion
Change buildTree() to work with new struct
Pass command to insertNode() instead of argv[count]
Deal with errors associated with changing struct
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What has been done works, but not the way it
should. The argv portion that needs to be copied
not just pointed at.
Fix execute.c --> See previous commit
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Also add NULL terminators to allow
for execing (and printfing)