Improving log support in LaTeX parser

Sources/Euler/Algebra/Parser/LaTeX.swift

@@ -184,19 +184,24 @@ public extension Parser {
             }
             // Finding Group2
             open = 1
-            index += 1 // skipping `(`
+            index += 6 // skipping `\\left(`
             let endg1 = index
             while open > 0 {
-                guard index < out.count else { return latex }
-                if out[index] == "(" {
+                guard index + 6 < out.count else { return latex }
+                if out[index..<index + 6] == "\\left(" {
                     open += 1
-                } else if out[index] == ")" {
+                    index += 5
+                } else if out[index...index + 6] == "\\right)" {
                     open -= 1
+                    index += 6
                 }
                 index += 1
             }
             let g2start = out.index(out.startIndex, offsetBy: endg1)
-            let g2end = out.index(out.startIndex, offsetBy: index - 1)
+            let g2end = out.index(out.startIndex, offsetBy: index - 7)
+            
+            guard g2start < g2end else { return latex }
+            
             let group2 = out[g2start..<g2end]