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transactions operations

The third section contains functions to add, edit, and remove transactions from the transactions linked list, as follows:

struct Node *findNodeById(int id, struct Node *withinNode) {    struct Node *node = withinNode;    while (node != NULL) {        if (node->id == id) return node;        node = node->next;    }    return NULL;}void addTransaction(int id, int categoryId, float rawAmount,                    float cookedAmount) {    appendNode(&transactionsHead, id, categoryId, rawAmount, cookedAmount);}void editTransaction(int id, int categoryId, float rawAmount,                     float cookedAmount) {    struct Node *foundNode = findNodeById(id, transactionsHead);    if (foundNode != NULL) {        foundNode->categoryId = categoryId;        foundNode->rawAmount = rawAmount; foundNode->cookedAmount ...