Removed unused feature.

Optimized use statements in main.

Simplified truth_combinations code a little.

Updated OpenAPI spec

spec/options.tsp

@@ -0,0 +1,46 @@
+namespace Options;
+
+@summary("Options for simplifying an expression")
+model SimplifyOptions {
+  @summary("Whether to simplify the expression")
+  simplify?: boolean = true;
+
+  @summary("Whether to ignore case when simplifying")
+  ignoreCase?: boolean = false;
+}
+
+@summary("Sort order for a truth table")
+enum Sort {
+  DEFAULT,
+  TRUE_FIRST,
+  FALSE_FIRST,
+}
+
+@summary("Whether to hide specific rows in a truth table")
+enum Hide {
+  NONE,
+  TRUE,
+  FALSE,
+}
+
+@summary("Options for generating a truth table")
+model TableOptions {
+  @summary("Sort order for the truth table")
+  sort?: Sort = Sort.DEFAULT;
+
+  @summary("Hide specific rows in the truth table")
+  hide?: Hide = Hide.NONE;
+
+  /**
+   * Hide intermediate steps when generating the truth table
+   * For example in the expression "A and B or C", the intermediate step is: A and B
+   */
+  @summary("Hide intermediate steps when generating the truth table")
+  hideIntermediateSteps?: boolean = false;
+}
+
+@summary("Options for simplifying an expression and generating a truth table")
+model SimplifyTableOptions {
+  ...SimplifyOptions;
+  ...TableOptions;
+}